Question

A car starts from rest and attains a velocity of 18km/h in2sec find acceleration in si units

Answer 1

Answer:

Explanation:

CAR STARTS FROM REST INDICATES THAT,

INITIAL VELOCITY , U = 0 M/S

FINAL VELOCITY, V= 18 KM /H = 18*5/18       [ TO COVERT KM /H TO M/S

                                                      = 5 M/S                 MULTIPLY BY 5/18]

TIME TAKEN = 2 SEC

ACCELERATION, A =?

WE KNOW THAT, ACCORDING TO NEWTONS FIRST LAW,

V= U+AT

5 = 0+ A*2

A = 5/2

ACCELERATION= 2.5 M/S².

HOPE THIS HELPS.

Answer 2

Answer:

acceleration:

                      2.5m/s^2

Explanation:

Initial velocity u = 0 m/s.

Final velocity v = 18 km/hr = (18x5/18) = 5 m/s.

Time t = 2s

Finding Acceleration a = v-u / at

a=5-0/2

a=5/2

a = 2.5 m/s².

Hence, the acceleration of the car is 2.5 m/s².